CVE-2020-5353 : Security Advisory and Response

Dell Isilon OneFS and Dell EMC PowerScale OneFS are affected by a vulnerability that allows unauthorized access to an 'admin' home directory, potentially leading to system compromise.

Understanding CVE-2020-5353

This CVE involves a default configuration issue in the Network File System (NFS) of Dell Isilon OneFS and Dell EMC PowerScale OneFS, enabling attackers to exploit NFS to gain administrative access.

What is CVE-2020-5353?

The vulnerability in Dell Isilon OneFS versions 8.2.2 and earlier and Dell EMC PowerScale OneFS version 9.0.0 allows attackers to manipulate files via NFS, potentially granting them administrative privileges.

The Impact of CVE-2020-5353

The vulnerability has a CVSS base score of 8.8 (High severity) with significant impacts on confidentiality, integrity, and availability. Attackers can exploit this flaw to rewrite sensitive files and compromise the system.

Technical Details of CVE-2020-5353

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The default NFS configuration in Dell Isilon OneFS and Dell EMC PowerScale OneFS exposes an 'admin' home directory, enabling attackers to spoof Unique Identifiers (UIDs) and gain unauthorized access.

Affected Systems and Versions

Dell Isilon OneFS versions 8.2.2 and earlier
Dell EMC PowerScale OneFS version 9.0.0

Exploitation Mechanism

Attackers can leverage a spoofed UID over NFS to rewrite sensitive files, potentially leading to unauthorized administrative access.

Mitigation and Prevention

Protecting systems from CVE-2020-5353 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to mitigate the vulnerability.
Restrict network access to vulnerable systems and directories.
Monitor file system activities for suspicious behavior.

Long-Term Security Practices

Implement least privilege access controls to limit user permissions.
Regularly review and update NFS configurations to adhere to security best practices.

Patching and Updates

Dell has likely released patches or updates to address the vulnerability. Ensure timely installation of these fixes to secure the affected systems.